i have 3 apple ids - can i make them put them together in one?

hello - i have 3 aplle ids by now (one from my old email address when i still had a pc which is also my itunes account, one that i got with my apple products, and one new one with new family name as i got married...) can i put them "together"? especially all on one cloud and one itunes account?

hope someone understands my question ;-))

THX